Among them: the Interstate 880-Highway 92 interchange in the East Bay, the Highway 101-Highway 92 interchange on the Peninsula, the approaches to the Golden Gate Bridge in San Francisco, and the Highway 101-Interstate 580 interchange and the Highway 101-Sir Francis Drake interchange in Marin County.

Transportation officials have asked people to avoid driving if at all possible and to take transit instead.

Here are some transit options:

-- BART will add extra trains and special hourly overnight service to 14 stations Friday through Monday.

-- AC Transit will pick up and drop off its passengers heading to and from San Francisco at four BART stations: Coliseum-Oakland Airport, MacArthur, North Berkeley and West Oakland, from Friday through Monday.

-- The Golden Gate, Vallejo Baylink and Alameda/Oakland ferries will run extra service on Saturday, Sunday and Monday. The Alameda Harbor Bay ferry will add extra trips Friday.

-- WestCAT bus service will not serve San Francisco during the bridge-closure days.

For a complete listing of transit schedules, or to get real-time traffic information, go to www.511.org or dial 511.